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Power spectra of the interplanetary magnetic field

✍ Scribed by James W. Sari; Norman F. Ness

Publisher
Springer
Year
1969
Tongue
English
Weight
602 KB
Volume
8
Category
Article
ISSN
0038-0938

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✦ Synopsis

Power spectra based on Pioneer 6 interplanetary magnetic field data in early 1966 exhibit a frequency dependence off ~ in the range 2.8 β€’ 10 -4 to 1.6 β€’ 10 2cps for periods of both quiet and disturbed field conditions. Both the shape and power levels of these spectra are found to be due to the presence of directional discontinuities in the microstructure (< 0.01 AU) of the interplanetary magnetic field. Power spectra at lower frequencies, in the range of 2.3 β€’ 10 6 to 1.4 x 10 4 cps, reflect the field macrostructure (> 0.1 AU) and exhibit a frequency dependence roughly between f-1 and f-~/2. The results are related to theories of galactic cosmic-ray modulation and are found to be consistent with recent observations of the modulation.

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